A/2019 G2
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	6 Dec 2019	20.7	2.312 AU	1.928 AU	10h59m	+33°35'	99.9°	24.8°	290°
Nearest approach	9 Jan 2020	19.8	2.345 AU	1.467 AU	08h19m	+54°50'	145.5°	13.7°	204°
Today	17 Sep 2026	28.9	18.013 AU	17.041 AU	23h41m	-17°39'	164.7°	0.8°	358°

The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. The displayed light curve is calculated under the assumption that the object remains inactive. (H=16.30; G=.15).

Charts

The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Orbital elements

The orbital elements of A/2019 G2 are:

    e (Eccentricity)                : 0.9943840
    q (Perihelion distance)         : 2.3118390
    i (Inclination)                 : 159.27880
    Ω (Longitude of ascending node) : 208.29590
    ω (Argument of perihelion)      : 82.90830
    L (Longitude of perihelion)     : 125.87255
    B (Latitude of perihelion)      : 20.55548
    T (Time of perihelion passage)  : 2458823.60010
    P (Orbital period in years)     : 8352.10

    Epoch                           : 2026 May 29
    Reference                       : MPC194160

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-09-16 00:00 UT   23 41 23.6   -17 37 29    17.031   18.005  165.1    0.8   352   28.9 
2026-09-17 00:00 UT   23 41 08.9   -17 39 03    17.038   18.011  164.8    0.8   356   28.9 
2026-09-17 09:25 UT   23 41 03.2   -17 39 40    17.041   18.013  164.7    0.8   358   28.9 
2026-09-18 00:00 UT   23 40 54.3   -17 40 37    17.045   18.016  164.4    0.9   360   28.9 
2026-09-19 00:00 UT   23 40 39.7   -17 42 10    17.053   18.021  164.0    0.9     3   28.9 
2026-09-20 00:00 UT   23 40 25.1   -17 43 41    17.061   18.026  163.5    0.9     7   28.9 
2026-09-21 00:00 UT   23 40 10.5   -17 45 11    17.069   18.032  162.9    0.9    10   28.9 
2026-09-22 00:00 UT   23 39 55.9   -17 46 41    17.077   18.037  162.4    1.0    13   28.9 
2026-09-23 00:00 UT   23 39 41.3   -17 48 09    17.086   18.042  161.7    1.0    15   28.9 
2026-09-24 00:00 UT   23 39 26.8   -17 49 35    17.095   18.048  161.1    1.0    18   28.9 
2026-09-25 00:00 UT   23 39 12.3   -17 51 01    17.104   18.053  160.4    1.1    20   28.9 
2026-09-26 00:00 UT   23 38 57.9   -17 52 25    17.114   18.058  159.7    1.1    22   28.9 
2026-09-27 00:00 UT   23 38 43.5   -17 53 48    17.124   18.063  158.9    1.1    24   28.9 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.